My 5 year old step daughter's hair is a mess. It is so broke off and damaged. It has not grown and the condition of it has not changed over the last 3 and 1/2 years. I took her to the hair dresser on Saturday for the first time for some deep conditioning and to start to get it going on the right track.(which should have been done along time ago by her mother I think). I was thinking of maybe giving her a small dosage of biotin or some other vitamins to help it start to grow but I don't know if it is safe for a 5 year old.